.vacancy-calculator-wrapper {
max-width: 800px;
margin: 0 auto;
font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
color: #333;
line-height: 1.6;
}
.calc-container {
background: #f9f9f9;
border: 1px solid #e0e0e0;
border-radius: 8px;
padding: 30px;
box-shadow: 0 4px 6px rgba(0,0,0,0.05);
margin-bottom: 40px;
}
.calc-grid {
display: grid;
grid-template-columns: 1fr 1fr;
gap: 20px;
}
@media (max-width: 768px) {
.calc-grid {
grid-template-columns: 1fr;
}
}
.input-group {
margin-bottom: 15px;
}
.input-group label {
display: block;
font-weight: 600;
margin-bottom: 5px;
font-size: 14px;
color: #2c3e50;
}
.input-group input {
width: 100%;
padding: 12px;
border: 1px solid #ddd;
border-radius: 4px;
font-size: 16px;
box-sizing: border-box;
}
.input-group input:focus {
outline: none;
border-color: #3498db;
box-shadow: 0 0 0 2px rgba(52,152,219,0.2);
}
.btn-calc {
background-color: #3498db;
color: white;
border: none;
padding: 15px 25px;
font-size: 16px;
font-weight: bold;
border-radius: 4px;
cursor: pointer;
width: 100%;
transition: background-color 0.2s;
margin-top: 10px;
}
.btn-calc:hover {
background-color: #2980b9;
}
.results-area {
background: #fff;
border: 1px solid #eee;
border-radius: 6px;
padding: 20px;
margin-top: 25px;
display: none;
}
.results-area.visible {
display: block;
}
.result-row {
display: flex;
justify-content: space-between;
align-items: center;
padding: 10px 0;
border-bottom: 1px solid #eee;
}
.result-row:last-child {
border-bottom: none;
}
.result-label {
color: #666;
font-weight: 500;
}
.result-value {
font-weight: 700;
font-size: 18px;
color: #2c3e50;
}
.result-value.highlight {
color: #e74c3c;
font-size: 24px;
}
.result-value.good {
color: #27ae60;
}
.formula-box {
background: #e8f4fd;
border-left: 4px solid #3498db;
padding: 15px;
margin: 20px 0;
font-size: 15px;
}
.error-msg {
color: #e74c3c;
font-size: 14px;
margin-top: 5px;
display: none;
}
function calculateVacancy() {
var totalUnitsInput = document.getElementById('totalUnits');
var vacantUnitsInput = document.getElementById('vacantUnits');
var avgRentInput = document.getElementById('avgRent');
var errorMsg = document.getElementById('errorMsg');
var resultsArea = document.getElementById('resultsArea');
var totalUnits = parseFloat(totalUnitsInput.value);
var vacantUnits = parseFloat(vacantUnitsInput.value);
var avgRent = parseFloat(avgRentInput.value);
// Validation
if (isNaN(totalUnits) || isNaN(vacantUnits) || totalUnits <= 0 || vacantUnits totalUnits) {
errorMsg.style.display = 'block';
errorMsg.innerHTML = "Vacant units cannot be greater than total units.";
resultsArea.classList.remove('visible');
return;
}
// Handle optional rent
if (isNaN(avgRent) || avgRent < 0) {
avgRent = 0;
}
errorMsg.style.display = 'none';
// Calculations
var vacancyRate = (vacantUnits / totalUnits) * 100;
var occupancyRate = 100 – vacancyRate;
var monthlyLoss = vacantUnits * avgRent;
var annualLoss = monthlyLoss * 12;
// DOM Updates
document.getElementById('resVacancyRate').innerText = vacancyRate.toFixed(2) + '%';
document.getElementById('resOccupancyRate').innerText = occupancyRate.toFixed(2) + '%';
// Format currency
var currencyFormatter = new Intl.NumberFormat('en-US', {
style: 'currency',
currency: 'USD',
});
document.getElementById('resMonthlyLoss').innerText = currencyFormatter.format(monthlyLoss);
document.getElementById('resAnnualLoss').innerText = currencyFormatter.format(annualLoss);
// Status Logic
var statusElem = document.getElementById('resStatus');
if (vacancyRate <= 4) {
statusElem.innerText = "High Occupancy (Excellent)";
statusElem.style.color = "#27ae60";
} else if (vacancyRate <= 8) {
statusElem.innerText = "Standard Market Rate";
statusElem.style.color = "#f39c12";
} else {
statusElem.innerText = "High Vacancy (Action Needed)";
statusElem.style.color = "#e74c3c";
}
resultsArea.classList.add('visible');
}
How is Vacancy Rate Calculated?
Understanding how vacancy rate is calculated is fundamental for real estate investors, property managers, and market analysts. The vacancy rate represents the percentage of all available units in a rental property or complex that are currently unoccupied and not generating income.
A high vacancy rate may indicate that the property is in a less desirable location, the rent is too high, or property management needs improvement. Conversely, a very low vacancy rate suggests strong demand but might also imply that rental rates could be raised.
The Vacancy Rate Formula:
Vacancy Rate = (Number of Vacant Units ÷ Total Number of Units) × 100
Step-by-Step Calculation Example
To better understand the math behind the calculator, let's look at a practical example:
- Scenario: You own an apartment complex with 50 apartments.
- Current Status: Currently, 3 of those apartments are empty and looking for tenants.
- Step 1: Divide the vacant units (3) by the total units (50).
3 ÷ 50 = 0.06
- Step 2: Multiply by 100 to get the percentage.
0.06 × 100 = 6%
In this scenario, the vacancy rate is 6%. This means the occupancy rate is 94%.
Physical Vacancy vs. Economic Vacancy
While the calculator above determines Physical Vacancy (based on unit count), sophisticated investors also calculate Economic Vacancy. Economic vacancy measures the difference between the Gross Potential Rent (if every unit were full at market rate) and the actual rent collected.
Economic vacancy is often higher than physical vacancy because it accounts for:
- Units that are physically occupied but tenants are not paying rent (bad debt).
- Units used for models or offices (non-revenue generating).
- "Loss to Lease" (units rented below current market value).
What is a "Good" Vacancy Rate?
While this varies heavily by city and asset class (residential vs. commercial), general market benchmarks often suggest:
- 0% – 4%: Excellent (High demand, potential to raise rents).
- 5% – 8%: Healthy/Average (Typical turnover).
- 9%+: High (Indicates potential issues with pricing, condition, or marketing).
Why Calculate Revenue Loss?
The calculator above provides a "Revenue Loss" metric. This is critical because percentages can be abstract. Knowing that a 10% vacancy rate is costing you $36,000 per year creates a stronger incentive to improve marketing strategies or tenant retention programs than simply knowing the percentage alone.